Two charges with q11C and q225C are separated by the distanc

Two charges with q1=-1C and q2=25C are separated by the distances shown in the illustration below. What is the x-component of the Colombo force on charge q2? Use k = 1 x 10^10 Nm^2 / C^2.

Solution

Fx = Fcos(thetha)

cos(thetha) = 4/5

=> Fx = Kq1q2/r^2*4/5 = 10^10*-1*25*0.8)/(5^2) = -8000000000

option B